Renesas ISL26104AV28EV1Z Operating instructions

Brand: Renesas

Model: ISL26104AV28EV1Z

Type: Operating instructions

Rev 1.00 Dec 2017

User’s Manual

ISL26104AV28EV1Z

User’s Manual: Evaluation Board

Industrial Analog and Power

AN1800 Rev. 1.00 Page 2 of 37

Dec 15, 2017

AN1800

Rev. 1.00

Dec 15, 2017

ISL26104AV28EV1Z

Evaluation Board

USER’S MANUAL

1. Overview

The ISL26104AV28EV1Z provides a means to evaluate the functionality and performance of the ISL26104 A/D

converter.

The board includes an AT90USB162 microcontroller with a USB interface. The microcontroller connects to the

ISL26104 ADC through a galvanically isolated interface and provides serial communication through USB between the

board and the computer.

The evaluation software provides a GUI (Graphical User Interface) that allows the user to configure the ISL26104

device, to capture data, to process and plot the results in the time domain or as a histogram, and perform frequency

domain analysis on the captured data. The evaluation software also enables the user to save conversion data from the

ADC to a file, or to save the results of the analyzed conversion data.

1.1 Key Features

• ADC is galvanically-isolated from USB connection

• On-board microcontroller

• On-board voltage reference

• Evaluation software

• Time domain analysis

• Noise histogram analysis

• FFT analysis

1.2 Ordering Information

1.3 Related Literature

• For a full list of related documents, visit our website

•ISL26104 product page

Part Number Package (Pb-Free)

ISL26104AV28EV1Z Evaluation Board

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Dec 15, 2017

ISL26104AV28EV1Z 1. Overview

Figure 1. Evaluation Board for the ISL26104



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Dec 15, 2017

ISL26104AV28EV1Z 2. Functional Description

2. Functional Description

2.1 Hardware

The ISL26104AV28EV1Z evaluation board enables evaluation of the ISL26104 Analog-to-Digital Converter

(ADC). The ISL26104 is a high performance 24-bit ADC that includes a very low noise programmable gain

amplifier. The ISL26104 offers multiple gain selections: 1x, 2x, 4x, 8x, 16x, 32x, 64x, and 128x. It offers 20 word

rate selections from 2.5Sps to 4000Sps (clock = 4.9152 MHz). Gain and word rate selections are made by writing

to on-chip registers.

The board comes with an ISL26104 soldered in place. This can be removed and an ISL26102 soldered in its place

if desired.

2.2 Evaluation Board Overview

The ISL26104AV28EV1ZA evaluation board is made up of two sections. These sections are galvanically isolated

with a multi-channel isolation chip. The two different sections of the board can be readily identified in Figure 1 on

page 3, which shows an image of the board. The ISL26104 ADC and its associated circuitry (voltage reference and

input signal components) are on the left side of the image. The ADC and its associated circuitry are powered by a

laboratory supply. The microcontroller with its USB interface is on the right side of the image. This circuitry is

powered from the USB connection. See Figure 2 for a block diagram of the circuitry. The microcontroller provides

the USB interface to the computer. Evaluation software is available to communicate with the microcontroller and to

collect and analyze data from the ADC.

Figure 2. Block Diagram of the Evaluation Board for the ISL26104

DVDD AGND AVDD

Ext. Clk

AIN+

AIN-

AIN+

VREF +

VREF -

AVDD

AGND

ISL21090

2.5 V

ISL26104

VREF

Header

Selection

SDO/RDY

SCLK

AT90USB162

Microcontroller

USB

Galvanic

Isolators

SDI

USB 5

SW1 -SW 4

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Dec 15, 2017

ISL26104AV28EV1Z 2. Functional Description

2.3 Galvanic Isolation

Galvanic isolation is not necessary in every application. The purpose of the isolation on the evaluation board is to

prevent noise from the USB ground connection from affecting the sensitive measurements made by the ADC when

used in the 64X or 128X gain settings. The ground connection of the USB cable in most computers is referenced

directly to the power supply ground of the computer. This ground can be especially noisy in notebook computers

powered from an external power module. Operating the ADC on a power system that is galvanically isolated from

the USB ground ensures that the performance of the ADC on the evaluation board will not be affected by ground

noise from the computer being used to collect data from the board.

2.4 ADC Section

The ADC section of the evaluation board has three banana jack power connections that enable this portion of the

board to be powered from a low noise laboratory supply.

• AGND serves as the power supply ground connection for the ADC segment of the board.

• DVDD supplies the digital portion of the ADC (3.3V to 5V) and the section of the galvanic isolation chip that

interfaces to the ADC.

• AVDD supplies the analog portion of the ADC and the voltage reference.

The voltage reference used in the ADC circuitry is a ISL21090BFB825Z-TK 2.5V reference. A header is provided

to also allow the use of an external voltage reference for the ADC. The ADC portion of the circuitry on the board is

illustrated in Figure 3.

The ISL26104 offers several sample rate, gain, and input channel options. These options are selected using on-chip

registers that can be written by the evaluation software. When a command to change the gain, the rate, or the

multiplexer channel is issued by the evaluation software, the command is sent over the USB connection to the

microcontroller on the evaluation board. The microcontroller then writes into the proper ADC register through the

serial port using the CS/, SDI, SDO/RDY, and SCLK signals which are connected to the ADC from the

microcontroller through the isolation chip as shown in Figure 4 on page 6.

Figure 3. ISL26104 Analog-to-Digital Converter

ISL26104

AVDD DVDD

PWDN

SDI

SCLK

DVDD

2DGND

XTALIN/CLOCK

XTALOUT

5DGND

DVDD

7DGND

8DGND

9CAP

10 CAP

11 AIN1+

12 AIN1-

13 AIN3+

14 AIN3-

15 AIN4-

16 AIN4+

17 AIN2-

18 AIN2+

19 VREF-

20 VREF+

21 AGND

AVDD

LSPS

SDI

PWDN

SCLK

RDY

ISL26104

C11

0.1uF

X7R

C12

0.1uF

X7R

C13

2700pF

X7R

10K

HDR2X1

LSPS

J20

HDR4X2

RED

200

RED

200

4.9152 MHz

NO-POP

SMA

C10

0.1uF

NO-POP

C28

0.10uF

POLY

R4 200

VREF+

VREF-

AIN1+

AIN1-

AIN2+

AIN2-

AIN3+

AIN3-

AIN4+

AIN4-

AGND

AVDD DVDD

AGND AGND

AGND

DVDD

AGND

SDO/RDY

AGND

AGND AGND

AVDDAGNDDVDD

J19

J21

J23

DVDD AGND AVDD

Connections to Isolator

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Dec 15, 2017

ISL26104AV28EV1Z 2. Functional Description

Figure 4. Galvanic Isolator Chip

The ADC uses a 4.9152MHz crystal operating with an on-chip amplifier for its clock source. This can be

disconnected and an external clock can be sourced to drive the clock input to the chip. Alternately, the

XTALIN/CLOCK pin can be grounded and the ADC will operate from an on-chip RC type oscillator.

The board provides a 2.5V reference IC as the voltage reference for the ADC, as shown in Figure 5, or an external

voltage can be connected to input terminals on the board (VREF+ and VREF-) and selected through jumpers on

headers J25 and J26 to provide a reference voltage for the ADC as shown in Figure 6. These headers also provide

the option of selecting AVDD and AGND as inputs to the VREF+ and VREF- on the ADC.

Figure 5. 2.5V Reference

VDD1

GND1

A1 4

A2 5

A3 6

EN1/NC

GND1

9GND2

10 EN2/NC

11 B4

12 B3

13 B2

14 B1

15 GND2

16 VDD2

SI8441BB

0.1uF

X7R

0.1uF

X7R

R36 1K

AGND

DVDD

SDI

SDO/RDY

USB_5V

AGND DGND

MOSI

SCLK

DGND

MISO

AGND

SCLK

Connections to ADC

Connections to Microcontroller

1GND_OR_NC

2VIN

3DNC

4GND 5

TRIM

VOUT

DNC

ISL21090BFB825Z-TK

2.500V

C19

1uF

X7R C21

0.1uF

X7R

AGND

AVDD

AGND

2.5V_VREF

AGND

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Dec 15, 2017

ISL26104AV28EV1Z 2. Functional Description

Figure 6. Voltage Reference Selection Options

The evaluation board provides separate terminal connections for each of the differential signals into the ADC.

These terminals are in shown in Figure 7. Pay attention to the labeling of the connections and their polarities when

connecting external signals. The channel numbers on the terminal blocks are not in numerical order and some have

their polarities labeled opposite of others.

Figure 7. Analog Inputs

VREF+

VREF-

AVDD

VREF+

2.5V

GND

VREF-

J24

C27

0.1uF

X7R

J25

HDR3X2

J26

HDR3X2

R12 10

R13 10

C29

47uF

NO-POP

AVDD

2.5V_VREF

AGND

VREF+

VREF-

AIN1+

AIN1-

AIN2+

AIN2-

AIN3+

AIN3-

AIN4+

AIN4-

4700pF

X7R

0.01uF

X7R

0.01uF

X7R

HDR2X1

J10

HDR2X1

J11

4700pF

X7R

0.01uF

X7R

0.01uF

X7R

J12

HDR2X1

J13

HDR2X1

J14

C14

4700pF

X7R

C15

0.01uF

X7R

C16

0.01uF

X7R

J15

HDR2X1

J16

HDR2X1

C17

4700pF

X7R

C18

0.01uF

X7R

0.01uF

X7R

HDR2X1

AGND

AIN1+

AIN1-

CMB

AGND

AIN2-

AIN2+

CMB

AGND

AIN3+

AIN3-

CMB

AGND

AIN4-

AIN4+

CMB

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ISL26104AV28EV1Z 2. Functional Description

Figure 8. Common Mode Selections

Header connector J17, shown in Figure 8, allows the user to select one of the following options for the common

mode bias (CMB) voltage:

• The 2.5V voltage reference output

• Ground (AGND)

• A voltage generated by a resistor divider (RDIV) that divides the AVDD supply using two 1k resistors

• A voltage determined by the user that must be connected to the hole next to the header connection labeled FLT

(Floating Input)

The voltage source that is selected by header J17 is provided to the analog input channels as a common mode bias

voltage (CMB).

Each of the input channels has jumpers (for example, J9 and J10 for input AIN1 in Figure 7) to allow the user to

connect the common mode bias (CMB) voltage to either the AIN+ or the AIN- input of the channel. This enables

the external signal source to be biased to a common mode value supplied by the board. If both jumpers are put in

place, and the analog inputs to the terminals are left disconnected, the inputs to this particular AIN channel of the

ADC will be shorted to the common mode voltage. This provides a means for testing the noise performance of the

ADC with both of its inputs (AIN+ and AIN-) shorted to a common mode voltage.

The ADC interfaces to the microcontroller through the galvanic isolators. The ADC side of the isolator chip is

2.5 Microcontroller Section

Figure 9 on page 9 illustrates the microcontroller circuitry. A reset button is provided but it is seldom necessary to

use. The microcontroller has its own power-on reset which initializes the microcontroller when the USB interface is

connected to a computer. Power for the microcontroller section comes from the USB interface. The microcontroller

circuit includes a DIP switch, three LEDs, and two header connectors.

The board is shipped from the factory with the four switches of the DIP switch set to the OFF position. This is

required for normal operation. Other switch positions are used at the factory to troubleshoot the isolator interface if

the board is not functioning properly. These switch positions are not useful for normal board applications, and

should be kept in the OFF position.

The three LEDs light up when the USB interface is connected and actively powered. Some of the LEDs blink when

the microcontroller is passing a command to the ADC or when data is being collected from the ADC.

2.5V

GND

RDIV

J17

HDR4X2

R19

R20

FLT

CMB 2.5V_VREF

AGND

AVDD

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Dec 15, 2017

ISL26104AV28EV1Z 2. Functional Description

The microcontroller section includes two headers. Header J1 is a six pin connection used to program the flash in the

microcontroller. Header J22 provides access to the four signals that are used by the microcontroller to interface to

the ADC.

If desired, customers could remove the isolator chip from the board and use header J22 to connect their own

circuitry to the ADC. This enables the customer to use the evaluation software to evaluate the ADC in the

customer's system. An alternate method of connection is to remove the ISL26104 device from the board and

connect into the customer circuit through the signals on header J20. If this method is chosen, the customer would

need to power the ADC side of the isolator chip from his system (3V to 5V).

The microcontroller communicates with the ADC through the galvanic isolator chip. The microcontroller side of

the isolator is powered by the voltage from the USB connection.

Figure 9. Microcontroller with USB Interface

RESET

USB

SW4

SW3

SW2

SW1

1XTAL1

2XTAL2

3GND

4VCC 5

PC2(PCINT11)

PD0(OC.0B/INT0) 7

PD1(AIN0/INT1) 8

PD2(RXD1/AIN1/INT2) 9

PD3(TXD1/INT3) 10

PD4(INT5) 11

PD5(XCK/PCINT12) 12

PD6(RTS/INT6) 13

PD7(CTS/HWB/T0/INT7)

PB0(SS/PCINT0) 15

PB1(SCLK/PCINT1) 16

PB2(PDI/MOSI/PCINT2) 17

PB3(PDO/MISO/PCINT3) 18

PB4(T1/PCINT4) 19

PB5(PCINT5) 20

PB6(PCINT6) 21

PB7(PCINT7/OC.0A/OC.1C)

PC7(INT4/ICP1/CLKO) 23

PC6(OC.1A/PCINT8)

24 RESET

PC5(PCINT9/OC.1B) 26

PC4(PCINT10)

27 UCAP

28 UGND

29 D+/SCK

30 D-/SDATA

31 UVCC

32 AVCC

AT90USB162-16AU

8.000MHz

C20

22pF

COG

C22

22pF

COG

PC2

PC4

PC5

PC6

PC7

PD3

PB0

PB7

PB6

PB5

SW-DIP4

LED1 LED2 LED3

200

PWR 2

D- 3

D+ 4

GND

CASE 6

CASE

J18

USB-B

R5 22

R10 22

FB1

C23

1UF

X7R

R11

47K

J22

HDR4X2

HDR3X2

VBUS

DGNDDGNDDGND

MISO

MOSI

SCLK DGND

USB_5V

DGND

USB_5V

RESET

USB_5V

DGND

MISO

RESET

SCLK

USB_5V

MOSI

DGND

SCLK

MOSI

MISO

C24

0.1uF

X7R

C25

0.1uF

X7R

C26

0.01uF

X7R

DGND

USB_5V

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Dec 15, 2017

ISL26104AV28EV1Z 2. Functional Description

2.6 Power Supply Sequencing

The board is made up of two galvanically isolated sections. The ADC portion is powered by a laboratory supply.

The microcontroller section is powered by the USB connection.

Proper voltages from an external supply must be provided to the DVDD (3.3V to 5V), AVDD (5V), and the AGND

banana plug connectors for the ADC portion of the board to function. LEDs, as shown in Figure 3, will light up

when DVDD and AVDD are powered. Note that these supplies, AVDD and DVDD, can be applied and removed in

any sequence without regard to each other or with regard to whether the USB interface is connected and powered.

The USB interface can also be disconnected and reconnected without consequence with regard to whether the

power supply to the ADC section of the board is powered.

In other words, there is no power supply sequencing requirement for any of the supplies to the board, whether from

the ADC section powered by the laboratory supply, or the microcontroller section powered by the USB connection.

2.7 Quick Start Guide

The evaluation board includes evaluation software for computers running Microsoft Windows XP or later.

2.8 Installing the Evaluation Software

Use the following link to go to the ISL26104 product page.

www.intersil.com/products/ISL26104

On the Documents tab, locate the Software section. Click the link to download the evaluation software setup

program. The software setup program has a license agreement that must be accepted to install the software.

When the setup program has been downloaded, run setup.exe and follow the on-screen instructions.

The software communicates with the evaluation board using the USB interface. The software uses the USB HID

driver included with the Windows operating system, so it is not necessary to load any other USB drivers.

2.9 Running the Evaluation Software

Note that the fonts and colors in the evaluation software are dictated by the operating system, and may vary from

what is shown in this document.

Before starting the evaluation software, connect the evaluation board to the computer with a USB cable.

To start the evaluation software, click

Start > All Programs > Renesas > ISL261XX Evaluation Software > ISL261XX Evaluation Software

If the software is started before the connection to the board is made, the software will indicate that the USB

interface is not connected with the message: USB Status: Not Connected as shown in Figure 10.

If this occurs, connect the evaluation board to the computer with the USB cable. The USB status should change to

USB Status: Connected as shown in Figure 11 on page 11.

Figure 10. USB Not Connected

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ISL26104AV28EV1Z 2. Functional Description

Figure 11. USB Connected

The screen shows the File menu and four tabs: Configuration, Time Domain, Histogram, and Frequency Domain.

In Figure 12, the Configuration window is the active window.

(1) To configure the evaluation board, select the part number for the evaluation board to be tested. For Device

Selection, select the appropriate part number.

(2) Ensure that the ADC section of the board is powered by the laboratory power supply so that the evaluation

software can communicate with the ISL26104.

(3) Click Initialize.

Figure 12. Device Selection

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ISL26104AV28EV1Z 2. Functional Description

Figure 13. Block Diagram

After the Initialize button is clicked with the ISL26104 selected, the screen shows a block diagram of the

ISL26104 ADC. The block diagram includes drop-down menus to select various options, such as the Input Mux

channel and Gain as shown in Figure 13.

The ISL26104 device uses on-chip registers for configuration. Use the Configuration window to set up the various

options for the ISL26104 device.

Some of these options are:

• Input channel (Input Mux)

• Sample Rate

•Gain

Use the Sample Rate drop-down menu to select the Sample Rate, as shown in Figure 14 on page 13. Sample rates

from 2.5 to 4000 samples per second can be selected.

Use the Input Mux drop-down menu to select the input channel, as shown in Figure 15 on page 14.

Use the Gain menu to select the gain, as shown in Figure 16 on page 14.

Any time a menu option is changed, click the Write Values button, which instructs the evaluation software to send

a command to the chip to change the appropriate on-chip register.

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ISL26104AV28EV1Z 2. Functional Description

Note that you can change multiple items (such as Sample Rate, Input Mux, or Gain) and click the Write Values

button only once for all the selections to be written to the evaluation board.

Figure 14. Sample Rate Selection

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ISL26104AV28EV1Z 2. Functional Description

Figure 15. Input Mux Selection

Figure 16. Gain Selection

To perform offset calibration, click the Offset Calibration button.

This issues a command for the ISL26104 to run its offset calibration operation. During offset calibration, the value

of the on-chip offset registers is displayed in the Offset field in the lower left of the Configuration window.

Note that three 8-bit offset registers (high, mid, and low) inside the ISL26104 make up the entire 24-bit offset

value. The decimal value of this 24-bit word is what is displayed in the Offset field as shown in Figure 17.

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ISL26104AV28EV1Z 2. Functional Description

Figure 17. Offset Field

Figure 18. SPI Communications

The SPI Communications field is shown at the bottom of the configuration window, as shown in Figure 18.

After entering Hex values into the Address text box and the Data text box, click the SPI WR button to write an

8-bit value to the on-chip register associated with that address. Or, if the Data text window is empty and a Hex

value is entered into the Address window, click the SPI RD button to read the 8-bit value of the selected register

from the chip and show it in the Data text field.

For example, if you select '128' in the Gain drop-down menu and then click the Write Values button, the gain

You can then use the SPI Comm feature to read the register back. Enter 17 (the address to read the on-chip gain

value) into the Address window and the click the SPI RD button. The value '7' will be returned and shown in the

Data window. Hex '7' indicates that the binary value in the register was set to '00000111', gain = 128.

2.10 Signal Processing Windows

The evaluation software includes three other tabs: Time Domain, Histogram, and Frequency Domain. These tabs

are shown in Figure 19.

Figure 19. Main Window Tabs

Each of these windows are described in the following sections. All three allow the user to collect and process data

from the ADC on the evaluation board.

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ISL26104AV28EV1Z 2. Functional Description

2.11 Time Domain Window

Use the Time Domain window to collect samples from the ADC on the evaluation board and show them in the time

domain. The number of samples is initially defaulted to 64, but can be set from 1 to 1048576 (220). If a large

number of samples is requested on an ADC with a slow sample rate, be aware of the amount of time required for

data collection. When the Acquire button is clicked, the samples are collected and transferred to the computer.

The main graphing window can graph up to 256 samples. If more than 256 samples are collected, the time plot of

the entire sample set can be shown by clicking the Pop Out button. Figures 20 and 21 show the capture of 4096

samples. The window in Figure 20 shows only the first 256 samples. Figure 21 shows the results when the Pop Out

button has been selected.

Figure 20. Time Domain Window

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ISL26104AV28EV1Z 2. Functional Description

Figure 21. Time Domain Pop-Out

The buttons at the top of the plot provide several graph tool functions as follows:

Figure 22. Graphing Toolbar

The button options shown in Figure 22 are also available in the Histogram and Frequency Domain windows.

House: Zooms to the original zoom scale factor.

Left/Right: Goes back/forward 1 zoom command. So if you zoom in twice and want to go back to the first zoom,

you'd click the left arrow.

Four Points: Moves the axes around.

Magnifying Glass: Zoom box.

Scaling (Up/down/left/right): Changes the size of the plot in the window. You can scale the graph as large as the

border.

Check Box (Customize): Allows customization of axis labels/plot title as shown in the Figure 23.

Disk (Save): Saves the plot as an image. When selected, a window will open that offers several image format

options.

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ISL26104AV28EV1Z 2. Functional Description

When the data from the ADC has been captured, it can be saved to a file. The histogram and the spectrum analysis

can also be saved. See “Data File Formats” on page 30 for a discussion of the formats of the saved files. Note that

the raw data (conversion words from the ADC) files can also be read back into the evaluation software after it is

saved. Or data collected from another source can be read into the evaluation software for analysis if the proper data

format is used. See “Data File Formats” on page 30 for details.

Figure 23. Custom Labels

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ISL26104AV28EV1Z 2. Functional Description

2.12 File Operations

The File menu includes the following options, as shown in Figure 24.

Figure 24. File Menu

The File > Load Data option allows the user to read back into the evaluation software raw data (conversion words

for the ADC) once saved or, data collected from another source can be read into the evaluation software for

analysis if the proper data format is used. See “Data File Formats” on page 30 for more information.

The File > Save option is available only after data has been collected using the functions on the Time Domain,

Histogram, or Frequency Domain windows. Figure 25 on page 19 shows that the options under the File > Save

selection are Raw Data (text), Histogram Data (text), Spectrum Data (text), All Data (Excel), and Configuration.

These options allow the user to save data to a file. The file formats for each of the options are discussed in “Data

File Formats” on page 30. Note that the Excel format is for Excel 2003 and is limited to 65k cells, which limits the

number of samples that can be saved in this format.

The File >Save > Configuration option allows the user to save the register configuration of the ADC that is being

used to collect data. See “Data File Formats” on page 30 for an example configuration file format.

Figure 25. Save Selections

The File > About option shows the version number of the microcontroller firmware, and the evaluation software

version as shown in Figure 26. The firmware version is read from the microcontroller when the evaluation software

starts.

Figure 26. About Box

The File > Exit option closes the evaluation software.

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Dec 15, 2017

ISL26104AV28EV1Z 2. Functional Description

2.13 Histogram Window

After collecting data using the Time Domain window, click the histogram window to plot the histogram of the time

domain data. Alternatively, use the options in the Histogram window to set the number of samples to be collected

and to acquire a new sample set based upon this selection. Use the Bin Width window to set the number of

converter codes that are counted in one bin of the histogram. This number is “1” by default.

When the histogram is plotted, the plot includes markers for the mean value (red vertical line) and for one standard

deviation from the mean on each side (green dashed lines). Signal statistics are listed in the plot itself and in the text

boxes below the graph as shown in Figure 27. The Pop Out button shows the graph without the statistics listed.

Figure 27. Histogram Window

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Renesas ISL26104AV28EV1Z Operating instructions

Renesas ISL26104AV28EV1Z Operating instructions

Renesas ISL26104AV28EV1Z Operating instructions

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